Year	constant 2015 US$
2006	18807276.619467624
2007	19181755.933484197
2008	16275389.697919099
2009	20070747.807740282
2010	18204322.008982044
2011	23770480.283065453
2012	38446263.02579567
2013	47196894.86854916
2014	45263764.35889859
2015	71265353.95803438
2016	60142163.39705898
2017	53828711.33792956
2018	44421888.249929
2019	35360943.85275752
2020	34036231.755618095
2021	45143272.94851724